On Fri, 2026-07-17 at 06:59 +0000, Arthur Kiyanovski wrote: > Implement the gettimexattrs64 and getcrosststampattrs callbacks in the > ptp_vmclock driver to provide clock quality attributes through the new > PTP_SYS_OFFSET_EXTENDED_ATTRS and PTP_SYS_OFFSET_PRECISE_ATTRS ioctls. > > The ptp_vmclock device exposes: > - error_bound: Derived from time_maxerror_nanosec, accumulated with > counter frequency error (counter_period_maxerror_rate_frac_sec) over > elapsed counter ticks > - clock_status: Mapped from the device's clock_status field > - timescale: Always reports TAI (UTC sources are converted by tai_adjust() > before the attributes are populated) > > The legacy ioctls return -EINVAL when clock_status is UNRELIABLE since > they have no way to communicate clock state to userspace. The attrs > ioctls have a status field for this purpose, so they treat UNRELIABLE > as success and let userspace check the status field. > > To avoid a race where the hypervisor could update clock_status between > the timestamp call and the UNRELIABLE check, the clock state is captured > inside the seq_count loop for a consistent snapshot with the timestamp. > > Signed-off-by: Arthur Kiyanovski <[email protected]>
Reviewed-by: David Woodhouse <[email protected]>
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